Add files to view.state.values in TS

[seratch]

Summary

This pull request adds a new value to view.state.values data structure for view_submission request patterns. See https://api.slack.com/reference/block-kit/block-elements#file_input for details of the new file_input block element.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad14372) 82.21% compared to head (2e9dd3c) 82.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1995   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files          18       18           
  Lines        1524     1524           
  Branches      438      438           
=======================================
  Hits         1253     1253           
  Misses        175      175           
  Partials       96       96           

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